The paper reports on the bi-stable turbulent wake dynamics of a three-dimensional bluff body. It is shown that the occurrence of the switching between the two wake states decreases as the turbulent intensity of the incoming flow is made larger by an additional upstream grid. A detailed analysis of the jumps statistics indicates that the turbulent fluctuation of each wake state is also decreased. It is concluded that the states switching is thus triggered by large fluctuations produced by the wake instabilities and not by those of the incoming flow. It is also shown that increasing the free-stream turbulence intensity reinforces the permanent asymmetry of each state and increases the wake sensitivity to residual asymmetries.

Olivier Cadot ^{1};
Maha Almarzooqi ^{2, 1};
Antoine Legeai ^{3, 1};
Vladimir Parezanović ^{2};
Luc Pastur ^{3}

@article{CRMECA_2020__348_6-7_509_0, author = {Olivier Cadot and Maha Almarzooqi and Antoine Legeai and Vladimir Parezanovi\'c and Luc Pastur}, title = {On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry}, journal = {Comptes Rendus. M\'ecanique}, pages = {509--517}, publisher = {Acad\'emie des sciences, Paris}, volume = {348}, number = {6-7}, year = {2020}, doi = {10.5802/crmeca.32}, language = {en}, }

TY - JOUR AU - Olivier Cadot AU - Maha Almarzooqi AU - Antoine Legeai AU - Vladimir Parezanović AU - Luc Pastur TI - On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry JO - Comptes Rendus. Mécanique PY - 2020 SP - 509 EP - 517 VL - 348 IS - 6-7 PB - Académie des sciences, Paris DO - 10.5802/crmeca.32 LA - en ID - CRMECA_2020__348_6-7_509_0 ER -

%0 Journal Article %A Olivier Cadot %A Maha Almarzooqi %A Antoine Legeai %A Vladimir Parezanović %A Luc Pastur %T On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry %J Comptes Rendus. Mécanique %D 2020 %P 509-517 %V 348 %N 6-7 %I Académie des sciences, Paris %R 10.5802/crmeca.32 %G en %F CRMECA_2020__348_6-7_509_0

Olivier Cadot; Maha Almarzooqi; Antoine Legeai; Vladimir Parezanović; Luc Pastur. On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry. Comptes Rendus. Mécanique, Volume 348 (2020) no. 6-7, pp. 509-517. doi : 10.5802/crmeca.32. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.32/

[1] Phyllotaxis as a physical self-organized growth process, Phys. Rev. Lett., Volume 68 (1992) no. 13, pp. 2098-2101 | DOI

[2] The leaf venation as formed in a tensorial field, Eur. Phys. J. B, Volume 28 (2002) no. 2, pp. 135-138 | DOI

[3] Single-particle diffraction and interference at a macroscopic scale, Phys. Rev. Lett., Volume 97 (2006) no. 15, 154101 | DOI

[4] Unpredictable tunneling of a classical wave-particle association, Phys. Rev. Lett., Volume 102 (2009) no. 24, 240401 | DOI

[5] Reflectional symmetry breaking of the separated flow over three-dimensional bluff bodies, Phys. Rev. E, Volume 86 (2012), 035302

[7] Bifurcations and symmetry breaking in the wake of axisymmetric bodies, Phys. Fluids, Volume 20 (2008), 051702 | DOI | Zbl

[8] Transition to turbulence in the wake of a sphere, Phys. Rev. Lett., Volume 83 (1999) no. 1, pp. 80-83 | DOI

[9] A magnetoelastic strange attractor, J. Sound Vib., Volume 65 (1979) no. 2, pp. 275-296 | DOI | Zbl

[10] Diffusive dynamics and stochastic models of turbulent axisymmetric wakes, J. Fluid Mech., Volume 778 (2015), p. R2 | DOI | MR | Zbl

[11] Stochastic modelling and feedback control of bistability in a turbulent bluff body wake, J. Fluid Mech., Volume 802 (2016), pp. 726-749 | DOI | MR

[12] Some salient features of the time-averaged ground vehicle wake, SAE Technical Paper (1984), 840300 | DOI

[13] Turbulent wake past a three-dimensional blunt body. Part 1. Global modes and bi-stability., J. Fluid Mech., Volume 722 (2013), pp. 51-84 | DOI | Zbl

[14] Turbulent elliptic wakes, J. Fluids Struct., Volume 13 (1999) no. 7-8, pp. 1041-1067 | DOI

[15] Turbulent wake past a three-dimensional blunt body. Part 2. Experimental sensitivity analysis., J. Fluid Mech., Volume 752 (2014), pp. 439-461 | DOI

[17] Chaotic dynamics of large-scale structures in a turbulent wake, Phys. Rev. Fluids, Volume 2 (2017), 034604 | DOI

[18] Simulations of the bi-modal wake past three-dimensional blunt bluff bodies, J. Fluid Mech., Volume 866 (2019), pp. 791-809 | DOI | MR | Zbl

[19] The mechanics of the formation region of vortices behind bluff bodies, J. Fluid Mech., Volume 25 (1966) no. 02, pp. 401-413

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